It depends on what your needs are. I use Jira with the Greenhopper plugin, but that's probably heavy for what you're looking for. There's a ton that goes on be

It depends on what your needs are. I use Jira with the Greenhopper plugin, but that's probably heavy for what you're looking for. There's a ton that goes on behind the scenes with it and you can spend countless hours tinkering with it. The key selling point is that you can create custom workflows for specific client and project needs. If you want something light, take a look at SmartQ (http://www.getsmartq.com/ http://www.getsmartq.com/) or Trello (https://trello.com/ https://trello.com/).